Membership helps you network with other people who have the same passions and interests as you. Members often share ideas and materials. It provides great opportunities for professional development, outreach opportunities, trip ideas, and a way to make new friends. Often, membership fees are tax deductible. Membership might provide discounts to certain vendors. Also, many organizations publish journals or magazines to help improve the profession.

Biology

1) American Association for the Advancement of Science (AAAS)

2) American Fisheries Society (AFS)

3) American Museum of Natural History (AMNH)

4) American Elasmobranch Society (AES)

5) American Phytopathological Society (APS)

6) American Society for Microbiology (ASM)

7) American Society of Naturalists (ASN)

8) Association of Southeastern Biologists

9) Entomological Society of America

10) Evolution and the Nature of Science

11) National Association of Biology Teachers (NABT)

12) Organization of Biological Field Stations

13) Organization for Tropical Studies

14) World Health Organization  (WHO)

Chemistry

1) American Chemical Society (ACS)

Geology

1) Geological Society of America (GSA)

2) The Association for Women Geoscientists

3) The American Geological Institute  (AGI)

Physics

1) American Institute of Physics (AIP)